M. Mennig, K. Fries, M. Lindenstruth, H. Schmidt, Development of fast switching photochromic coatings on transparent plastics and glass, Thin Solid Filims,351, 230 (1999) CrossRef Google Scholar 64. V. Malatesta, Photochromic and thermochromic compounds, Chapter 10: photodegradation of organic photochromes, Plenum Press,4, 1 (1997) Google Scholar
Welch Township is a township in Goodhue County, Minnesota, United States. It lies about halfway between the cities of Hastings and Red Wing and 36 miles southeast of Saint Paul. The population was 697 at the 2000 census. It is centered on the small community of Welch on the Cannon River. Like many river towns in the Driftless Area, it is situated at the base of the steep bluffs of the river valley.
McDowell County is a county in the U.S. state of West Virginia. As of the 2010 census, the population was 22,113. Its county seat is Welch. McDowell county is the southernmost county in the state. It was created in 1858 by the Virginia General Assembly and named for Virginia Governor James McDowell. It became a part of West Virginia in 1863, when several counties seceded from the state of Virginia during the American Civil War.